police are trying to basically lock down and hone in on any place and anybody in this environment, this young man primarily and any family members who may know where he is. i'm looking at couple shots we're getting here. back in watertown, you have ongoing presence of the police there as well. they're trying to focus in where he may have gone, if he remains in watertown. if he was able to slip perhaps out of that cordon and if indeed he is still on the run, bill. bill: yeah. martha, just one thing to add from boston on that. we're hearing that logan airport has been closed. we can't confirm it but we're being working to that. some folks are saying trying to book to flights in washington and those flights are being diverted. "the boston globe" is saying the m.i.t. police officer that was killed in a confrontation with these terror suspects was sean collier, age 26, out of summerville, massachusetts. per the district attorney in middlesex county. it is possible that sean come letter, age 26, will indeed be the hero of this story and sitting in his car and gunned down in his car we don't k